interconnects
them.
The
network
consists
of
elements
like
switches,
bridges,
and
repeaters
that
are
used
to
interconnect
the
fibre-channel
ports.
Fibre-channel
overview
for
the
DS8000
series
Each
storage
unit
fibre-channel
adapter
has
four
ports,
and
each
port
has
a
unique
worldwide
port
name
(WWPN).
You
can
configure
a
port
to
operate
with
the
SCSI-FCP
upper-layer
protocol
using
the
DS
Storage
Manager
or
the
DS
CLI.
You
can
add
fibre-channel
shortwave
and
longwave
adapters
to
a
DS8000
model.
For
details
on
the
host
systems
that
support
fibre-channel
adapters,
see
the
DS8000
Interoperability
Matrix
at
http://www.ibm.com/servers/storage/disk/ds8000/
or
the
System
Storage
Interoperation
Center
(SSIC)
at
Fibre-channel
adapters
for
SCSI-FCP
support
the
following
configurations:
v
A
maximum
of
64
host
adapter
ports
on
DS8100
Models
921
and
931
and
a
maximum
of
128
host
ports
on
DS8300
Models
922,
932,
9A2,
and
9B2
v
A
maximum
of
506
logins
per
fibre-channel
port
which
includes
host
ports
and
PPRC
target
and
initiator
ports
v
Access
to
63700
LUNs
per
target
(one
target
per
host
adapter),
depending
on
host
type
v
Either
arbitrated
loop,
switched-fabric,
or
point-to-point
topologies
ESCON-attached
System
z
and
S/390
hosts
overview
This
section
describes
how
you
can
attach
the
DS8000
storage
unit
to
ESCON-attached
System
z
and
S/390
hosts.
With
ESCON
adapters,
the
storage
unit
provides
the
following
configurations:
v
A
maximum
of
32
host
ports
for
DS8100
Models
921
and
931
and
a
maximum
of
64
host
ports
for
DS8300
Models
922,
932,
9A2,
and
9B2
v
A
maximum
of
64
logical
paths
per
port
v
Access
to
16
control-unit
images
(4096
CKD
devices)
over
a
single
ESCON
port
on
the
storage
unit
v
Zero
to
64
ESCON
channels;
two
per
ESCON
host
adapter
v
Two
ESCON
links
with
each
link
that
supports
up
to
64
logical
paths
A
DS8100
storage
unit
supports
up
to
16
host
adapters
that
provide
a
maximum
of
32
ESCON
links
per
machine.
A
DS8300
storage
unit
supports
up
to
32
host
adapters
that
provide
a
maximum
of
64
ESCON
links
per
machine.
Note:
ESCON
host
channels
limit
the
number
of
devices
per
channel
to
1024.
To
fully
access
4096
devices
on
a
storage
unit,
it
is
necessary
to
connect
a
minimum
of
four
ESCON
host
channels
to
the
storage
unit.
You
can
access
the
devices
through
a
switch
to
a
single
storage
unit
ESCON
port.
This
method
exposes
four
control-unit
images
(1024
devices)
to
each
host
channel.
The
FICON
bridge
card
in
ESCON
director
9032
Model
5
enables
a
FICON
bridge
channel
to
connect
to
ESCON
host
adapters
in
the
storage
unit.
The
FICON
bridge
architecture
supports
up
to
16
384
devices
per
channel.
This
enables
you
to
attach
other
control
units
or
other
storage
units
to
the
same
host
channel
up
to
the
limit
that
the
host
supports.
The
storage
unit
supports
the
following
operating
systems
for
System
z
and
S/390
hosts:
Chapter
1.
Introduction
to
IBM
System
Storage
DS8000
series
17
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